1 // Copyright (C) 2015-2019 Free Software Foundation, Inc. 2 // 3 // This file is part of the GNU ISO C++ Library. This library is free 4 // software; you can redistribute it and/or modify it under the 5 // terms of the GNU General Public License as published by the 6 // Free Software Foundation; either version 3, or (at your option) 7 // any later version. 8 9 // This library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 14 // You should have received a copy of the GNU General Public License along 15 // with this library; see the file COPYING3. If not see 16 // <http://www.gnu.org/licenses/>. 17 18 // { dg-do run { target c++11 } } 19 20 #include <memory> 21 #include <testsuite_hooks.h> 22 23 struct X : public std::enable_shared_from_this<X> { }; 24 25 bool share_ownership(const std::shared_ptr<X> & p1,const std::shared_ptr<X> & p2)26share_ownership(const std::shared_ptr<X>& p1, const std::shared_ptr<X>& p2) 27 { 28 return !p1.owner_before(p2) && !p2.owner_before(p1); 29 } 30 31 void test01()32test01() 33 { 34 std::shared_ptr<X> p1(new X); 35 VERIFY( share_ownership( p1->shared_from_this(), p1 ) ); 36 { 37 std::shared_ptr<X> p2(p1.get(), [](X*){}); 38 // The weak_ptr member of the enable_shared_from_this base should not 39 // be reset by creating a second control block that owns the pointer. 40 VERIFY( share_ownership( p2->shared_from_this(), p1 ) ); 41 } 42 VERIFY( share_ownership( p1->shared_from_this(), p1 ) ); 43 } 44 45 int main()46main() 47 { 48 test01(); 49 } 50